Starter-crank for explosive-engines.



P. W. COEN. STARTER CRANK FOB EXPLOSIVE ENGINES.

APPLICATION FILED AUG. 19,1907. 1

Patented Jan. 5, 1909.

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. shaft of the engine. in starting, but which- To all whom it may concern:

- UNITED STATES" PATENT OFFICE;

FREDERICK W. GOEN OF CHICAGO, ILLINOIS.

STABTEBFOBANI FOR EDLOBIVI-BKG'INEB.

Specification of Letters Patent.

Patented Jan. "5, 1909 Application filed August 18, 1907. Serial No. 359,126.

I Be it known that I, FREDERICK W. Conn, a citizen of the United States, residing at Chi cago, in the county of Cook and State of Illi- I 101S, have invented certainnew and useful Improvements in Starting-Cranks for Exlosive-Engines, of which the following is a ,ull, clear, and exact specification. I l

The invention relates to a crank adapted especially for use in connection with internal combustion engines in manually starting or turning over the. same.

Heretoforej'a common disadvantage and danger has existed in the backward turns of the engines, due to premature explosions vduring the starting 0 eration, thus causing the crank or startin evice to be either. violently torn from the ands of the operator, or, as is usually the case, particularly in the use of starter cranks on automobile engines, the operator having a firm grasp on the handle a sudden backward turn of the crank carries his-head or-otherportions of-the body violently against some prominent portion of the machine.

The'ob'eot of the invention is to provide an improve form of crank or starting device that may be used: in turning overthe crank when the engine. suddenl back due to t remature explosions wi to an extent, re ease its positive connectlon and so prevent the revolution of the crank or startin device in a reverse direction with sufficient orce to injure the operator.'

To the attainment of-these ends and the accomplishment of other new and useful ob:

.jects, as will appear, the invention consists in i the features of novelty in the construction combination and arrangement ofthe several parts hereinafter more'fully described and claimed, as shown in the accompanyin drawings illustrating an. exemplification o this invention, and-1n which Fi re 1 is aside elevat on ofthestarter cran embodying the invention showing the same attachedto. the" ratcheted; end ofa broken crank shaft, which crank shaft 8. pears in dotted lines in'the drawing intheil ustra tion. Fig. 2 is a frontlelevatlon of; a, portion. of the device shown-in Fig.1. Fig. 3Tis a sec; tional view of the starter crank similarto'. thatv shown in. Fig. 1 but containing theaddition,

f .i ofga bushin "surroundingitheshortshaft or, the; crank or the purposes hereinafter a described.

cross pin 11 and is a a. ted to enter the end 12 of a protruding, on of an engine crank shaft, the cross pin 11 being adapted to engage suitable teeth 12' constructed in the usual manner so that the cross pin is efiective only in turning the crank shaft of cate adjustment or clamping action of the collar 13 on the short shaft 10 The outer end of the arm 13 may be provided with any suitable handle-15 b which the crank is adaptedto be grasped y the hand of the operator.

tion employed: in; securing the arm 1 -'to the shaft 10 thatian 'desire degree of, friction may be produce gbetween, the lshaft and the arm and infire use of the irn. roved'crank, it" is desirable that a sufficient c am ing action be exercised on the shaft 10by t e tightening of the threaded pin 14 sothat whenthe The short shaft or in 10 is provided with of, the starter threadsforthe purpose of securing a deli- It will be apparent from theqc ns'truc- 1 o erator turns the arm l3 th'e' engine crank.

s .aft may be turned over fortherpur'poselof starting. The degree of clamping action, however, should be gagedso that the amount of friction between the arm and the shaft 10 will be only approximatelgsufficient to turn the engine over in ordent at when a remature explosion earriesi'the engine cra shaft in a reverse direction thev short shaft 1.0 will. be caused; to, turn. within the collar 1321;6- fore thearm 13 is torn from the hands or the operator or otherwise injures him.

Ainodifica'tionof the device isshow n.v in

Fi Q 3inwhioh a thitnibushinglfi, preferably at lra ssib'ut of; other desirable. material may be inserted: between thecofllar .13. and

theshort shaft 10, for. the purpose of re-V venting. any possible tendency of the; s ort shaft' 10 to ,stick" within the collar 13., due to the corrosion, or other action of-thearts;

order that the invention mig t be 1 fully understood, the details of an embodithe combination of a shaft with a ment thereof have described, and

What I claim as new is 1. In a starter crank for explosive engines, air of clutch members for driving the sai shaft forwardly, a startin crank connected with one of the said clutc members, the other of said clutch members bein connected with the shaft, a member of ductile and noncorrosive material ada ted for insertion between one of the clutc members and the cooperative element to which said member is attached, and means for continually binding the respective clutch member u on the said ductile and non-corrosive mem er, to re ate the degree of friction that is conbeen thus stant y exerted thereby.

2. In a starter crank for explosive engines, the combination with a crank arm of a short shaft adapted to engage an engine crank specifically l shaft, means for securing the arm to the short shaft comgrising a split collar and a threaded pin t erefor, and a bushing of ductile material inserted between the said 2 short shaft and the shlit collar.

3. In a starter crank for explosive engines, the comblnatlon with an arm, of a short shaft adapted to engage an engine crank shaft, means for exerting a pre etermined degree of holding action between said arm a and the said short shaft, and a bushing .of ductile and non-corrosive material inserted between the said short shaft and the arm.

In testimony whereof I have signed my name to this specification, in the resence of two subscribing witnesses, on't is 16th" H day of August, A. D. 1907.

FREDERICK W. COEN. 'Witnesses:

AJgL. SPRINKLE, HARRIET M. TELLER. 

